What Causes Visceral Fat? Risks and Solutions

Visceral fat, the deep abdominal fat surrounding organs such as the liver and pancreas, is one of the most clinically significant forms of body fat. Unlike subcutaneous fat, it releases inflammatory proteins and fatty acids directly into the bloodstream, raising the risk of type 2 diabetes, cardiovascular disease and metabolic syndrome. Understanding what causes visceral fat to accumulate, how it is measured and what can be done about it is essential for protecting long-term health. This article explains the key drivers, from diet and inactivity to stress, sleep and hormones, and outlines when to seek medical advice.

What exactly is visceral fat and why does it matter for your health?

Visceral fat is metabolically active fat stored deep within the abdominal cavity that releases inflammatory proteins and fatty acids into the portal circulation, contributing to insulin resistance, metabolic syndrome and increased risk of type 2 diabetes and cardiovascular disease.

Visceral fat is the metabolically active fat stored deep within the abdominal cavity, surrounding organs such as the liver, pancreas and intestines, and it poses greater health risks than the subcutaneous fat found just beneath the skin. Unlike subcutaneous fat, which you can pinch, visceral fat is not visible from the outside and cannot be felt on examination. Its location is what makes it clinically significant.

Visceral fat is not metabolically inert. It releases fatty acids, inflammatory proteins and hormones directly into the portal circulation, which feeds the liver. This contributes to insulin resistance, raised triglycerides, low HDL cholesterol and elevated blood pressure, a cluster of abnormalities collectively known as metabolic syndrome. Over time, these changes are associated with increased risk of type 2 diabetes, cardiovascular disease, metabolic dysfunction-associated steatotic liver disease (MASLD, formerly known as non-alcoholic fatty liver disease or NAFLD) and certain cancers, including colorectal and pancreatic cancer.

Research consistently shows that people with high levels of visceral fat face elevated health risks even when their overall body weight falls within a normal range. This is sometimes described as being "metabolically obese at a normal weight". Conversely, some individuals with a higher body mass index (BMI) carry relatively little visceral fat and have a more favourable metabolic profile. This is why BMI alone is an imperfect tool for assessing cardiometabolic risk, and why understanding visceral fat specifically matters for clinical decision-making.

What causes visceral fat to build up around your organs?

Visceral fat accumulates when energy intake exceeds expenditure, but dietary composition, physical inactivity, genetics, age and ethnicity all shape where fat is deposited, with refined carbohydrates, fructose and alcohol particularly associated with visceral accumulation.

Visceral fat accumulates primarily when energy intake consistently exceeds energy expenditure over time, but the pattern of fat storage is shaped by a combination of genetic, dietary, hormonal and lifestyle factors. Not everyone who gains weight stores it viscerally; individual biology plays a substantial role in determining where fat is deposited.

Dietary composition matters as well as total calorie intake. Diets high in refined carbohydrates, added sugars (particularly fructose), ultra-processed foods and saturated fats are associated with preferential visceral fat accumulation. Excess fructose, found in sugary drinks and many processed foods, is metabolised largely in the liver and is associated with hepatic fat storage and visceral adiposity. Alcohol consumption is also independently associated with greater visceral fat deposition, including at moderate intake levels, though the strength of this association varies across studies.

Physical inactivity is a major driver. Skeletal muscle is a key site of glucose disposal, and reduced muscle mass or low activity levels impair this process, promoting fat storage. Sedentary behaviour, particularly prolonged sitting, is associated with visceral fat accumulation independently of total exercise time.^[6][7]

Genetics account for a meaningful proportion of individual variation in fat distribution. People of South Asian and East Asian heritage tend to accumulate visceral fat and face elevated cardiometabolic risk at lower BMI thresholds than people of White European heritage, which has implications for how risk thresholds are interpreted clinically. Age is also a factor: visceral fat tends to increase with age even when total body weight remains stable, partly due to hormonal changes and declining muscle mass.

Does stress, poor sleep or hormones make visceral fat worse?

Yes. Chronic stress raises cortisol, which directly stimulates visceral fat deposition, while poor sleep disrupts hunger hormones; menopause, low testosterone and hypothyroidism also independently promote abdominal fat accumulation.

Chronic psychological stress, poor sleep and hormonal imbalances all independently promote visceral fat accumulation, and their effects are often interrelated. Cortisol, the primary stress hormone produced by the adrenal glands, is a key mediator. Sustained elevation of cortisol, as occurs with chronic stress or conditions such as Cushing's syndrome, directly stimulates visceral fat deposition by activating glucocorticoid receptors that are particularly dense in abdominal adipose tissue.^[2][8]

Poor sleep quality and insufficient sleep duration are associated with increased visceral fat. Sleep deprivation raises cortisol and ghrelin (the hunger-stimulating hormone) while suppressing leptin (the satiety hormone), creating a hormonal environment that promotes overeating and preferential fat storage around the organs. Studies suggest that consistently sleeping fewer than six hours per night is associated with greater visceral adiposity, independent of diet and exercise habits, though individual studies vary and this should be interpreted as an association rather than a precise threshold.

Hormonal changes across the lifespan also contribute significantly:

• Menopause: The decline in oestrogen is associated with a shift in fat distribution from the hips and thighs towards the abdomen, increasing visceral fat even without overall weight gain.^[15][16]

• Low testosterone in men: Hypogonadism is associated with increased visceral adiposity and insulin resistance.

• Insulin resistance: Elevated insulin levels promote fat storage and inhibit fat breakdown, creating a self-reinforcing cycle.

• Hypothyroidism: Reduced thyroid hormone activity slows metabolism and is associated with fat accumulation.

If you suspect an underlying hormonal condition is contributing to weight gain around the abdomen, it is important to seek medical assessment rather than attempt self-treatment. A GP can help identify whether such a condition is present and arrange appropriate investigation.

How do doctors measure visceral fat in the UK?

UK clinicians primarily use waist circumference, recommended by NICE, with action thresholds varying by sex and ethnicity; DEXA, MRI and CT can quantify visceral fat precisely but are reserved for research or specialist settings.

Visceral fat cannot be measured directly in routine clinical practice without specialist imaging, so UK clinicians typically use proxy measures that are practical, inexpensive and well-validated. Waist circumference is the most widely used tool and is recommended by NICE as part of cardiovascular and metabolic risk assessment. It correlates more closely with visceral fat than BMI does and is straightforward to perform with a tape measure at the level of the midpoint between the lower rib and the iliac crest.

NICE guidance and NHS resources provide action thresholds for waist circumference. For people of White European, Black African, Caribbean or mixed heritage, increased risk is indicated at 94 cm or above in men and 80 cm or above in women, with substantially increased risk at 102 cm or above in men and 88 cm or above in women. Lower thresholds apply to people of South Asian, Chinese and Japanese heritage (and some other Asian groups), reflecting higher cardiometabolic risk at a given waist circumference: increased risk is indicated at 90 cm or above in men and 80 cm or above in women from these groups. If you are unsure which thresholds apply to you, your GP or practice nurse can advise.

The waist-to-hip ratio and waist-to-height ratio are additional tools used in research and some clinical settings. A waist-to-height ratio above 0.5 is widely cited as a marker of elevated cardiometabolic risk, and some UK public health bodies have highlighted it as a useful screening measure.

For more precise quantification, dual-energy X-ray absorptiometry (DEXA) scanning and magnetic resonance imaging (MRI) or computed tomography (CT) can distinguish visceral from subcutaneous fat, but these are not used routinely outside research or specialist settings. Bioelectrical impedance devices, including some consumer scales, estimate visceral fat but vary considerably in accuracy and should be interpreted cautiously.

Can you lose visceral fat through diet and exercise alone?

Yes. Visceral fat is metabolically responsive and is preferentially mobilised during a calorie deficit; aerobic exercise, a Mediterranean-style diet and limiting alcohol are the most evidence-based approaches, with NICE-approved medicines available where lifestyle changes are insufficient.

Visceral fat responds well to lifestyle intervention, and diet and exercise are the most effective first-line approaches for reducing it. Visceral fat is generally more metabolically responsive than subcutaneous fat, meaning it tends to be mobilised preferentially during a calorie deficit, which is an encouraging finding for people making lifestyle changes.

Dietary approaches with the strongest evidence include:

• Reducing intake of ultra-processed foods, added sugars and refined carbohydrates

• Following a Mediterranean-style dietary pattern, rich in vegetables, legumes, wholegrains, fish and unsaturated fats

• Limiting alcohol, which is associated with visceral fat accumulation

• Avoiding sugar-sweetened beverages, including fruit juices

NHS guidance typically suggests a calorie deficit of around 600 kilocalories per day as a starting point for weight loss, though individual needs vary and the right approach should be guided by a healthcare professional.^[21][22]

Aerobic exercise is particularly effective at reducing visceral fat, even when total body weight changes little. Resistance training preserves and builds muscle mass, which improves insulin sensitivity and supports long-term fat loss. The UK Chief Medical Officers' Physical Activity Guidelines recommend at least 150 minutes of moderate-intensity aerobic activity per week for adults, alongside muscle-strengthening activities on two or more days.^[12][13]

Where lifestyle changes alone are insufficient, clinicians may consider additional support. For people with obesity and significant metabolic risk, weight management medicines such as semaglutide (Wegovy) or tirzepatide (Mounjaro) may be appropriate following clinical assessment; both have received NICE technology appraisal recommendations for use in eligible adults. Bolt Pharmacy is a GPhC-registered UK online pharmacy offering online weight-management consultations, with prescriber review and pharmacist support, where a range of options may be considered if clinically appropriate.

When should you speak to your GP about visceral fat levels?

Speak to your GP if your waist circumference exceeds NICE action thresholds, if you have metabolic syndrome or related conditions, or if you experience rapid unexplained abdominal weight gain or symptoms suggesting a hormonal disorder.

You should speak to your GP about visceral fat if your waist circumference exceeds the action thresholds described above, if you have been told you have metabolic syndrome, or if you have risk factors such as type 2 diabetes, high blood pressure, raised triglycerides or MASLD (formerly NAFLD). These conditions are closely linked to visceral adiposity, and addressing fat distribution may be an important part of managing them.

A GP can arrange relevant blood tests, including fasting glucose, HbA1c, a full lipid profile and liver function tests, to assess your cardiometabolic risk more fully. They can also screen for underlying hormonal conditions such as hypothyroidism, polycystic ovary syndrome or, where clinically indicated, Cushing's syndrome, all of which can contribute to visceral fat accumulation and may require specific treatment.

You should seek a GP appointment promptly if you notice:

• Rapid, unexplained weight gain around the abdomen

• Significant fatigue, excessive thirst or frequent urination (which may suggest developing diabetes)

• Symptoms suggestive of a hormonal disorder, such as unexplained weight gain with cold intolerance, hair loss or menstrual irregularity

For urgent symptoms such as chest pain, severe breathlessness or signs of a heart attack or stroke, call 999 immediately. For non-emergency health concerns that cannot wait for a GP appointment, NHS 111 can provide advice.

If you are concerned about your weight or metabolic health more broadly, your GP can refer you to NHS weight management services or discuss whether additional clinical support is appropriate. Access to local weight management services and referral pathways may vary depending on your local Integrated Care Board (ICB) and eligibility criteria. The NHS Diabetes Prevention Programme may also be relevant if you are at risk of developing type 2 diabetes. Lifestyle change remains the foundation of treatment, but it is most effective when supported by professional guidance tailored to your individual circumstances.

Scientific References

1. Adipose tissue dysfunction in obesity, diabetes, and vascular diseases.
2. Tissue production of cortisol by 11beta-hydroxysteroid dehydrogenase type 1 and metabolic disease.
3. Insulin resistance in type 2 diabetes: role of fatty acids.
4. Cardiometabolic Outcomes Among Adults With Abdominal Obesity.
5. Normal-Weight Obesity and Hidden Cardiometabolic Risk in Young Adults: Implications Beyond BMI-Based Classification.
6. Effects of sedentary behavior and daily walking steps on body mass index and body composition: Prospective observational study using outpatient clinical data of Japanese patients with type 2 diabetes.
7. General and visceral adiposity in black and white adolescents and their relation with reported physical activity and diet.
8. Hormonal control of regional fat distribution.
9. Adipose tissue distribution and function.
10. Overweight and obesity management – Identifying and assessing overweight, obesity and central adiposity (NG246).
11. NG246 Appendix A1: Summary of evidence from surveillance – lower BMI and waist circumference thresholds for South Asian and Chinese populations.
12. Physical activity guidelines: UK Chief Medical Officers' report.
13. UK Chief Medical Officers' physical activity guidelines (full guidance text).
14. Physical activity guidelines for adults aged 19 to 64.
15. Racial differences in body composition and cardiometabolic risk during the menopause transition: a prospective, observational cohort study.
16. Longitudinal associations of the endocrine environment on fat partitioning in postmenopausal women.
17. Testosterone and visceral fat in midlife women: the Study of Women's Health Across the Nation (SWAN) fat patterning study.
18. Tirzepatide for managing overweight and obesity (TA1026).
19. Semaglutide for managing overweight and obesity (TA875).
20. Comparative Evaluation of Waist-to-Height Ratio and BMI in Predicting Adverse Cardiovascular Outcome in People With Diabetes: A Systematic Review.
21. Calories and weight loss – calorie counting (NHS Better Health).
22. When the evidence about weight loss raises more questions (British Dietetic Association).

Frequently Asked Questions